Materials Literature
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The aim of this study was to investigate the eects of two dierent treatments, as-cast setup and solution heat treatment, on the general electrochemical corrosion resistance of Ti7Cu alloy samples immersed in a 0.9 wt% NaCl solution at 25 C. The microstructure was examined by scanning electron microscopy and X-ray dira…
Essential oil of aerial parts of Helichrysum italicum subsp. italicum was obtained by hydrodistillation and analyzed by GC and GC/MS. 54 compounds accounting for 97.1 % of the oil were identified. This essential oil was characterized by having a high content of oxygenated monoterpenes (45.9%) with neryl acetate was a…
This article describes a new on-line method for capacitance and dissipation factor measurements of high voltage bushings, for recording grid transients and for partial discharge monitoring at power transformers. Failure statistics identify HV bushings as one of the major reasons for transformer failures, which motivat…
The effects of Li substitution on the crystal structure and the strain properties of Bi0.5-(Na0.82K0.18)0.5(Ti0.95Sn0.05)O3 ceramics have been investigated. Li substitution enhanced the grain growth and densification, as well as the electric-field-induced strain (EFIS). Without Li substitution, the EFIS was 0.31% unde…
The thermal rectification has potential application in the thermal management of electronics and energy saving. This paper investigates the thermal rectification in silicon nanofilm with cone cavity by the non-equilibrium molecular dynamics simulation. The results show that the thermal resistance caused by the cone ca…
Piezoresponse force microscopy (PFM) has emerged as the tool of choice for characterizing piezoelectric and ferroelectric materials at nanoscale, yet the interpretation of PFM remains to be difficult and sometimes ambiguous. Built on earlier works, we developed a numerical integration scheme to analyze the expected PF…
Veselá J., Urbánková P., Černá K. and Neustupa J. 2012. Ecological variation within traditional diatom morphospecies: diversity of Frustulia rhomboides sensu lato (Bacillariophyceae) in European freshwater habitats. Phycologia 51: 552–561. DOI: 10.2116/11-101.1More than 300 strains of Frustulia rhomboides sensu lato w…
Binary complex salts, [Co(En) 3 ][Fe(CN)6] · 2H 2 O and [Co(En) 3 ] 4 [Fe(CN) 6 ] 3 · 15H 2 O, are synthesized. The properties of the salts and their thermolysis in air, dihydrogen, and argon are studied. Oxides of the central ions of the binary complex salts are found to be the thermolysis products in an oxidative at…
Abstract Strong surface enhancement Raman spectroscopy signal of 4-aminothiophenol on silver substrate prepared by controlled electrodeposition is documented in this article. Enhancement factor was found to be affected not only by nanoparticle size, shape, orientation and spatial distribution, but also by interaction…
We demonstrated high-voltage on/off switching with a vacuum switch by electron emission from a diamond p–i–n diode using negative electron affinity. An equivalent electrical circuit was modeled to evaluate and discuss the performance and potential of switches such as a high-voltage switch for high-voltage dc power gri…
ABSTRACT It is often useful to describe vulcanization reaction kinetics in terms of a mathematical model so that curing behavior may be predicted for different heat histories. Commonly used models for describing vulcanization kinetics are reviewed and discussed with emphasis on the mathematical relationships between t…
Solid solution treated aluminum alloy 6061 was tested in a series of planar impact experiments in which the initial sample temperature was varied between 296 and 902 K with special attention paid to the temperatures of the solid-liquid two-phase region. In the experiments, the free surface velocity histories were reco…
PURPOSE: Both polymer micelles and mesoporous silica nanoparticles have been widely researched as vectors for small molecular insoluble drugs. To combine the advantages of copolymers and silica, studies on the preparation of copolymer-silica composites and cellular evaluation were carried out. METHODS: First, a steari…
In this paper, the available experimental data for the density and viscosity of eutectic liquid alloys Al+Si, Pb+Bi, and Pb+Sn have been critically examined with the intention of establishing a reference standard representation of both density and viscosity. All experimental data have been categorized as primary or se…
Electron‐probe X‐ray microanalysis (XRMA) is a technique that can be used to simultaneously quantify C, N, O, Na, Mg, Al, Si, P, S, Cl, K, and Ca present in single cells collected from the sea, with a minimal treatment of the samples. The technique has been used to determine elemental composition in plankton using sca…
An instrumented creep testing capability is being developed for specimens irradiated in pressurized water reactor coolant conditions at the Advanced Test Reactor (ATR). A test rig has been developed such that samples will be subjected to stresses up to 350 MPa at temperatures up to 370°C in pile. Initial Idaho Nat…
ABSTRACT When the perturbation frequency imposed on a rubber falls within the glass transition zone of its viscoelastic spectrum, energy absorption is maximized. This phenomenon is the operative mechanism for various applications of elastomers requiring large energy dissipation. Nevertheless, a fundamental understandi…
The electronic structure of polycrystalline Bi2S3 thin films deposited by thermal evaporation under high vacuum conditions was investigated with respect to their potential use as absorber materials in p-i-n solar cells by means of hard x-ray photoemission spectroscopy at the PETRA III synchrotron. A clear influence of…
The effect of gamma-ray irradiation on relative permittivity, ac conductivity and dielectric loss tangent of epoxy resin and polyethylene has been investigated. Laminated samples were irradiated by60Co gamma source at room temperature in air with a dose rate of 10 kGy/h and the total dose were 100 kGy and 1000 kGy. Th…
Adsorption free energies for eight host-guest peptides (TGTG-X-GTGT, with X = N, D, G, K, F, T, W, and V) on two different silica surfaces [quartz (100) and silica glass] were calculated using umbrella sampling and replica exchange molecular dynamics and compared with experimental values determined by atomic force mic…